scientific article; zbMATH DE number 1116772

zbMATH Open1049.47041MaRDI QIDQ4376459

László Székelyhidi

Publication date: 17 May 2000

Title of this publication is not available (Why is that?)

zbMATH Keywords

Bounded linear, normal operatorsCommutative, noncommutative groupsd'Alembert's cosine equationHilbert space, inner product spaceHomomorphism into semigroup

Mathematics Subject Classification ID

Operator sine and cosine functions and higher-order Cauchy problems (47D09)

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Semi-Inner Products and Parapreseminorms on Groups and a Generalization of a Theorem of Maksa and Volkmann on Additive Functions ⋮ Title not available (Why is that?)

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